On Tue, 24 Jan 2012, Sebastian Kuzminsky wrote:
> Date: Tue, 24 Jan 2012 08:17:54 -0700
> From: Sebastian Kuzminsky <[email protected]>
> To: andy pugh <[email protected]>
> Cc: EMC developers <[email protected]>
> Subject: Re: [Emc-developers] hm2 watchdog changes
>
> On 01/24/2012 03:15 AM, andy pugh wrote:
>> On 24 January 2012 06:27, Sebastian Kuzminsky<[email protected]> wrote:
>>
>>> 2. The first time you call pet_watchdog() in HAL, the watchdog wakes up
>>> and becomes active.
>> Does that mean that an unpetted watchdog never bites? Fir example, if
>> you don't link the pet_watchdog function you can run hm2 without a
>> watchdog?
>
> Yes, that's the behavior that the current hm2-watchdog branch
> implements. But now that you mention it, that sounds kind of stupid...
>
>
>> Would it make sense for the read() and write() functions to also wake
>> the dog? In fact, why can't read() and write() also pet it
>
> That makes some sense, but I'm think there are sensible configs where
> you never read and sensible configs where you never write (stepper-only
> machines with no home switches, using hm2 as a logic analyser maybe,
> using one hm2 card for inputs and another one for outputs, etc). If we
> get rid of the pet_watchdog() function, I think we'd have to pet in both
> read() and write() to cover all cases, and that'd be wasteful.
>
> I like read() and write() waking up the watchdog, but i think i want to
> keep pet_watchdog() to do the work.
>
> I'll update the patchset tonight and repost. Thanks for the feedback!
>
>
> --
> Sebastian Kuzminsky
>
This looks like a big improvement on watchdog operation, and maybe fixes
clytles troubles.
I do like the idea of the first read or write enabling the watchdog. This
This means its impossible to run the hardware without a watchdog
(which is almost always a good thing) It might be a little nuisance
while testing things with halrun but I would feel better if the watchdog was
always enabled (and has a short default timeout).
Is there any way to make the pet_watchdog dependent on a cookie (dog_biscuit)?
That would make it possible for the watchdog to be conditionally enabled in
HAL
(so for example additional sanity checks could be logically ANDxed if desired)
Peter Wallace
Mesa Electronics
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